Abstract--The highest frequency near-infrared (NIR) combination bands for specimens of four species of mica--montmorillonite-beidellite, illite, chlorite, and kaolinite--were correlated with respect to AI203 content. A direct linear correlation was found between the combination band positions and the AI203 contents of the montmorillonite-beidellite series, which may be given as: ~ cm -~ = (5.38 + 0.04) (%
Versatile neutral polymeric bonding agents (NBPA's) have been developed for energetic propellants in which polar HMX particles are dispersed in a polar binder matrix containing highly polar plasticizers (TMETN, NG, etc.). Using a semi‐empirical approach through adjustment of solubility parameters and molecular weight, neutral acrylonitrile interpolymers were synthesized which mix uniformly with the submix and still have a high affinity for the HMX particles when they are added. Addition of about 0.2 % w/w of NPBA to HMX‐filled PEG binders increases the strength by a factor of as high as five compared to samples with no NPBA, and also eliminates the sudden decrease in modulus (knee) which occurs at relatively low elongation. The degree of filler reinforcement achieved by our NPBA's in energetic propellants is far superior to that achieved by adding nitrocellulose or any other previously proposed bonding agents, and similar to the effect of precoating the HMX particles with polyurea shells.
When hydrogen chloride–chlorine–argon mixtures are passed through a glow discharge and the products are condensed at 14°K, two conspicuous infrared absorptions at 956 and 696 cm−1 result. Concentration dependence of intensities, isotopic labeling, and force-field calculations lead to assignment of these bands to hydrogen dichloride. The force field calculated supports a linear, centrosymmetric (D∞h) structure with hydrogen bond strength apparently comparable to or exceeding those attributed to HCl2− in various crystals.
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